let baseUrl = "192.168.3.99";

// 获取当前登录用户
function getUser(key) {
	let token = uni.getStorageSync("loginToken");
	return parseJwt(token)[key];
}

// 封装ajax工具
function ajax(params) {
	//是否需要显示加载框
	var isloading = params.isloading == null ? true : params.isloading;
	
	if(isloading){
		uni.showLoading({
			title: "加载中..."
		})
	}
	
	
	// 准备一个请求头的对象
	let header = {"Content-Type":"application/x-www-form-urlencoded"};
	//获取jwt的token，并且放入到请求头中
	let token = uni.getStorageSync("loginToken");
	if (token) {
		header["Login-Token"] = token;
	}
	//console.log("ajax--loginToken----> ", header);
	
	uni.request({
		url: 'http://' + baseUrl + params.url,
		data: params.data ? params.data : {},
		method: params.type ? params.type : 'GET',
		header: header,
		success: (res) => {
			var code = res.data.code;
			if(code == 200 && params.success) {
				//调用传递过来的成功方法
				params.success(res.data.data);
			} else if(code == 507){
				//令牌失效/为空,强制跳转到登录页
				uni.navigateTo({
					url: "/pages/login/login"
				})
			} else {
				//失败
				console.log(res.data);
				uni.showToast({
					title: res.data.message,
					icon: "error"
				});
			}
		},
		complete() {
			uni.hideLoading();
		}
	})
}


//解析jwt令牌
function parseJwt(token) {
	let strings = token.split("."); //截取token，获取载体
	//通过base64解码
	var result = new Base64().decode(strings[1].replace(/-/g, "+").replace(/_/g, "/")).trim();
	var userinfo = JSON.parse(result);
	return userinfo;
}

//获取服务器的图片地址
function getImg(fileName){
	return "http://" + baseUrl + "/file/download?fileName=" + fileName;
}

// 判断是否登录
function isLogin() {
	let token = uni.getStorageSync("loginToken");
	if (token) {
		let user = parseJwt(token);
		// 获取令牌的过期时间
		let expireTime = user.exp;
		if ((new Date().getTime() / 1000) < expireTime) {
			return true;
		}
	}
	// 跳转到登录页
	uni.navigateTo({
		url: '/pages/login/login'
	})
	return false;
}

/** 
 * 
 * 自定义Base64编解码的方法
 * 
 * @author haitao.tu 
 * @date 2010-04-26 
 * @email tuhaitao@foxmail.com 
 * 
 */
function Base64() {

	// private property 
	var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

	// public method for encoding 
	this.encode = function(input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;
		input = this._utf8_encode(input);
		while (i < input.length) {
			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);
			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;
			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}
			output = output +
				_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
				_keyStr.charAt(enc3) + _keyStr.charAt(enc4);
		}
		return output;
	}

	// public method for decoding 
	this.decode = function(input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;
		input = input.replace(/[^A-Za-z0-9+/=]/g, "");
		while (i < input.length) {
			enc1 = _keyStr.indexOf(input.charAt(i++));
			enc2 = _keyStr.indexOf(input.charAt(i++));
			enc3 = _keyStr.indexOf(input.charAt(i++));
			enc4 = _keyStr.indexOf(input.charAt(i++));
			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;
			output = output + String.fromCharCode(chr1);
			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}
		}
		output = this._utf8_decode(output);
		// 替换不可见的特殊字符
		output = output.replace(/[\n\r\t]/g, "");
		output = output.trim();
		output = output.substring(0, output.lastIndexOf("}") + 1);
		return output;
	}

	// private method for UTF-8 encoding 
	this._utf8_encode = function(string) {
		string = string.replace(/rn/g, "n");
		var utftext = "";
		for (var n = 0; n < string.length; n++) {
			var c = string.charCodeAt(n);
			if (c < 128) {
				utftext += String.fromCharCode(c);
			} else if ((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			} else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}
		return utftext;
	}

	// private method for UTF-8 decoding 
	this._utf8_decode = function(utftext) {
		var string = "";
		var i = 0;
		var c = 0;
		var c1 = 0;
		var c2 = 0;
		var c3 = 0;
		while (i < utftext.length) {
			c = utftext.charCodeAt(i);
			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			} else if ((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i + 1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			} else {
				c2 = utftext.charCodeAt(i + 1);
				c3 = utftext.charCodeAt(i + 2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}
		}
		return string;
	}
}

export {
	getImg,
	ajax,
	baseUrl,
	isLogin,
	parseJwt,
	getUser
}